Derivative Instruments (Derivative Liabilities Offset in The consolidated Balance Sheets) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 11,932
Derivative liabilities	11,932
Fair Value of collateral	17,844
Total Gross amounts not offset in the statement of financial position including applicable netting agreement and fair value of collateral	17,844
Net Amount	$ 0

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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